Method for producing color and black plates in a multi-color plate making apparatus
US5134494A · kind A · utility
3Cited by
5References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 23, 1991 |
| Grant date | Jul 28, 1992 |
| Priority date | — |
| Expiry date | May 23, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/6027
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Light intensity values as picture information of a color original are obtained by using photographic density characteristic curves of the color-film original, instead of conventional density values. Thus obtained light intensity values are processed by conducting a specific tonal conversion formula (1) to obtain color-separation curves for color (C, M and Y) plates. On the basis of the color-separation curves for the color plates, a range to be entered black is determined, and a color-separation curve for a black (B) plate is set by conducting the same tonal conversion formula (1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.